Revision of the Coyotes. 27 



sprinkled with black hairs which reach down more than half way to heel ; 

 under side of tail fulvous, white basally, and with hairs of distal half 

 conspicuously tipped with black. 



Cranial and denta.l diameters. Skulls from Padre Island and Nueces Bay 

 are similar to those of C. pminsulte from Lower California, except that 

 they are somewhat larger, have decidedly longer rostrums and more ele 

 vated frontals. The elevation of the frontal shield posteriorly is greater 

 than in any other Coyote. The teeth, though relati vely smaller, are almost 

 as large as in peninsulse. In the Nueces Bay skulls the upper carnassial is 

 peculiarly swollen and rounded anteriorly, with the inner cusp set back 

 considerably behind the anterior plane of the tooth. 



Remarks. Canis frustror (assuming the name to apply to the Padre Island 

 specimen above described) resembles C. peninsulx from Lower California in 

 general characters, differing chiefly in somewhat larger size, paler colora 

 tion, shorter ears, larger amount of black on forearm, and longer rostrum. 



Measurements. $ young adult, Padre Island, Texas : total length, 1190 ; 

 tail vertebrae, 320 ; hind foot, 200. 



Cranial measurements. ^ adult from Padre Island, Texas : basal length, 

 182; basilar length of Hensel, 179; zygomatic breadth, 102 ; palatal length , 

 94 ; mastoid breadth, 63 ; length of crown of upper carnassial tooth, 19. 



Canis cagottis (Hamilton Smith). 



Li/ciscus cagottis Hamilton Smith, Jardine's Nat. Library, Mammals, vol. 



IV, 164, 1839. 

 ? Canis nigrirostris Licht., Abhandl. K. Akad. Wiss., Berlin (1827), pp. 105- 



106, 1830. 



Type locality. Rio Frio, betw r een City of Mexico and Puebla, Mexico. 



Characters* Similar to C. peninsulte, but slightly larger and redder, with 

 somewhat shorter ears, larger teeth, and broader rostrum. 



Color. Muzzle bright ferruginous; top of head grizzled buffy -grayish 

 and fulvous, the fulvous predominating, especially posteriorly; crown, 

 nape, and ears fulvous, deepest on the ears ; rest of upper parts grizzled 

 fulvous, buffy, and black (the black-tipped hairs worn off in the Cerro 

 San Felipe specimen, but probably very abundant and conspicuous in 

 winter pelage) ; fore legs and feet dull fulvous, with very little black over 

 wrists ; hind legs and feet deep fulvous on outer side, the legs abruptly 

 whitish on inner side and feet much paler on upper surface ; under sur 

 face of tail fulvous, whitish basally ; hairs of terminal third black-tipped. 



Cranial and dental characters. The skull of the adult male from Cerro 

 San Felipe agrees with that of the type specimen of Canis peninsula in 

 size and general cranial characters, but has the base of the rostrum 

 very much thicker and more swollen, a broader and shorter palate 

 (remarkably broad posteriorly), broader interpterygoid fossa, and much 

 shorter mandible, which is strongly bellied under the carnassial and 

 molars. The teeth are larger and heavier, particularly those of the lower 



* The present description is based on a specimen (tf adult) from the 

 Cerro San Felipe, Oaxaca, Mexico, in summer pelage. 



5 Bioi. Soc. WASH., VOL. XI, 181)7 



